A tooth infection, also known as a dental abscess, occurs when bacteria invade the inner part of a tooth, often due to untreated cavities or gum disease. This infection can cause pain, swelling, and sometimes fever. If left untreated, it may spread to surrounding tissues or even enter the bloodstream, leading to more serious health issues. Treatment typically involves draining the abscess and may require a root canal or tooth extraction. Antibiotics are often prescribed to eliminate the infection. Maintaining good oral hygiene and regular dental check-ups can help prevent tooth infections from occurring.